attr.c

   1 /*
   2  * Handle git attributes.  See gitattributes(5) for a description of
   3  * the file syntax, and Documentation/technical/api-gitattributes.txt
   4  * for a description of the API.
   5  *
   6  * One basic design decision here is that we are not going to support
   7  * an insanely large number of attributes.
   8  */
   9
  10 #define NO_THE_INDEX_COMPATIBILITY_MACROS
  11 #include "cache.h"
  12 #include "exec_cmd.h"
  13 #include "attr.h"
  14 #include "dir.h"
  15
  16 const char git_attr__true[] = "(builtin)true";
  17 const char git_attr__false[] = "\0(builtin)false";
  18 static const char git_attr__unknown[] = "(builtin)unknown";
  19 #define ATTR__TRUE git_attr__true
  20 #define ATTR__FALSE git_attr__false
  21 #define ATTR__UNSET NULL
  22 #define ATTR__UNKNOWN git_attr__unknown
  23
  24 /* This is a randomly chosen prime. */
  25 #define HASHSIZE 257
  26
  27 #ifndef DEBUG_ATTR
  28 #define DEBUG_ATTR 0
  29 #endif
  30
  31 struct git_attr {
  32         struct git_attr *next;
  33         unsigned h;
  34         int attr_nr;
  35         char name[FLEX_ARRAY];
  36 };
  37 static int attr_nr;
  38
  39 static struct git_attr_check *check_all_attr;
  40 static struct git_attr *(git_attr_hash[HASHSIZE]);
  41
  42 char *git_attr_name(struct git_attr *attr)
  43 {
  44         return attr->name;
  45 }
  46
  47 static unsigned hash_name(const char *name, int namelen)
  48 {
  49         unsigned val = 0, c;
  50
  51         while (namelen--) {
  52                 c = *name++;
  53                 val = ((val << 7) | (val >> 22)) ^ c;
  54         }
  55         return val;
  56 }
  57
  58 static int invalid_attr_name(const char *name, int namelen)
  59 {
  60         /*
  61          * Attribute name cannot begin with '-' and must consist of
  62          * characters from [-A-Za-z0-9_.].
  63          */
  64         if (namelen <= 0 || *name == '-')
  65                 return -1;
  66         while (namelen--) {
  67                 char ch = *name++;
  68                 if (! (ch == '-' || ch == '.' || ch == '_' ||
  69                        ('0' <= ch && ch <= '9') ||
  70                        ('a' <= ch && ch <= 'z') ||
  71                        ('A' <= ch && ch <= 'Z')) )
  72                         return -1;
  73         }
  74         return 0;
  75 }
  76
  77 static struct git_attr *git_attr_internal(const char *name, int len)
  78 {
  79         unsigned hval = hash_name(name, len);
  80         unsigned pos = hval % HASHSIZE;
  81         struct git_attr *a;
  82
  83         for (a = git_attr_hash[pos]; a; a = a->next) {
  84                 if (a->h == hval &&
  85                     !memcmp(a->name, name, len) && !a->name[len])
  86                         return a;
  87         }
  88
  89         if (invalid_attr_name(name, len))
  90                 return NULL;
  91
  92         a = xmalloc(sizeof(*a) + len + 1);
  93         memcpy(a->name, name, len);
  94         a->name[len] = 0;
  95         a->h = hval;
  96         a->next = git_attr_hash[pos];
  97         a->attr_nr = attr_nr++;
  98         git_attr_hash[pos] = a;
  99
 100         check_all_attr = xrealloc(check_all_attr,
 101                                   sizeof(*check_all_attr) * attr_nr);
 102         check_all_attr[a->attr_nr].attr = a;
 103         check_all_attr[a->attr_nr].value = ATTR__UNKNOWN;
 104         return a;
 105 }
 106
 107 struct git_attr *git_attr(const char *name)
 108 {
 109         return git_attr_internal(name, strlen(name));
 110 }
 111
 112 /* What does a matched pattern decide? */
 113 struct attr_state {
 114         struct git_attr *attr;
 115         const char *setto;
 116 };
 117
 118 struct pattern {
 119         const char *pattern;
 120         int patternlen;
 121         int nowildcardlen;
 122         int flags;              /* EXC_FLAG_* */
 123 };
 124
 125 /*
 126  * One rule, as from a .gitattributes file.
 127  *
 128  * If is_macro is true, then u.attr is a pointer to the git_attr being
 129  * defined.
 130  *
 131  * If is_macro is false, then u.pattern points at the filename pattern
 132  * to which the rule applies.  (The memory pointed to is part of the
 133  * memory block allocated for the match_attr instance.)
 134  *
 135  * In either case, num_attr is the number of attributes affected by
 136  * this rule, and state is an array listing them.  The attributes are
 137  * listed as they appear in the file (macros unexpanded).
 138  */
 139 struct match_attr {
 140         union {
 141                 struct pattern pat;
 142                 struct git_attr *attr;
 143         } u;
 144         char is_macro;
 145         unsigned num_attr;
 146         struct attr_state state[FLEX_ARRAY];
 147 };
 148
 149 static const char blank[] = " \t\r\n";
 150
 151 /*
 152  * Parse a whitespace-delimited attribute state (i.e., "attr",
 153  * "-attr", "!attr", or "attr=value") from the string starting at src.
 154  * If e is not NULL, write the results to *e.  Return a pointer to the
 155  * remainder of the string (with leading whitespace removed), or NULL
 156  * if there was an error.
 157  */
 158 static const char *parse_attr(const char *src, int lineno, const char *cp,
 159                               struct attr_state *e)
 160 {
 161         const char *ep, *equals;
 162         int len;
 163
 164         ep = cp + strcspn(cp, blank);
 165         equals = strchr(cp, '=');
 166         if (equals && ep < equals)
 167                 equals = NULL;
 168         if (equals)
 169                 len = equals - cp;
 170         else
 171                 len = ep - cp;
 172         if (!e) {
 173                 if (*cp == '-' || *cp == '!') {
 174                         cp++;
 175                         len--;
 176                 }
 177                 if (invalid_attr_name(cp, len)) {
 178                         fprintf(stderr,
 179                                 "%.*s is not a valid attribute name: %s:%d\n",
 180                                 len, cp, src, lineno);
 181                         return NULL;
 182                 }
 183         } else {
 184                 if (*cp == '-' || *cp == '!') {
 185                         e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
 186                         cp++;
 187                         len--;
 188                 }
 189                 else if (!equals)
 190                         e->setto = ATTR__TRUE;
 191                 else {
 192                         e->setto = xmemdupz(equals + 1, ep - equals - 1);
 193                 }
 194                 e->attr = git_attr_internal(cp, len);
 195         }
 196         return ep + strspn(ep, blank);
 197 }
 198
 199 static struct match_attr *parse_attr_line(const char *line, const char *src,
 200                                           int lineno, int macro_ok)
 201 {
 202         int namelen;
 203         int num_attr, i;
 204         const char *cp, *name, *states;
 205         struct match_attr *res = NULL;
 206         int is_macro;
 207
 208         cp = line + strspn(line, blank);
 209         if (!*cp || *cp == '#')
 210                 return NULL;
 211         name = cp;
 212         namelen = strcspn(name, blank);
 213         if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
 214             !prefixcmp(name, ATTRIBUTE_MACRO_PREFIX)) {
 215                 if (!macro_ok) {
 216                         fprintf(stderr, "%s not allowed: %s:%d\n",
 217                                 name, src, lineno);
 218                         return NULL;
 219                 }
 220                 is_macro = 1;
 221                 name += strlen(ATTRIBUTE_MACRO_PREFIX);
 222                 name += strspn(name, blank);
 223                 namelen = strcspn(name, blank);
 224                 if (invalid_attr_name(name, namelen)) {
 225                         fprintf(stderr,
 226                                 "%.*s is not a valid attribute name: %s:%d\n",
 227                                 namelen, name, src, lineno);
 228                         return NULL;
 229                 }
 230         }
 231         else
 232                 is_macro = 0;
 233
 234         states = name + namelen;
 235         states += strspn(states, blank);
 236
 237         /* First pass to count the attr_states */
 238         for (cp = states, num_attr = 0; *cp; num_attr++) {
 239                 cp = parse_attr(src, lineno, cp, NULL);
 240                 if (!cp)
 241                         return NULL;
 242         }
 243
 244         res = xcalloc(1,
 245                       sizeof(*res) +
 246                       sizeof(struct attr_state) * num_attr +
 247                       (is_macro ? 0 : namelen + 1));
 248         if (is_macro)
 249                 res->u.attr = git_attr_internal(name, namelen);
 250         else {
 251                 char *p = (char *)&(res->state[num_attr]);
 252                 memcpy(p, name, namelen);
 253                 res->u.pat.pattern = p;
 254                 parse_exclude_pattern(&res->u.pat.pattern,
 255                                       &res->u.pat.patternlen,
 256                                       &res->u.pat.flags,
 257                                       &res->u.pat.nowildcardlen);
 258                 if (res->u.pat.flags & EXC_FLAG_NEGATIVE)
 259                         die(_("Negative patterns are forbidden in git attributes\n"
 260                               "Use '\\!' for literal leading exclamation."));
 261         }
 262         res->is_macro = is_macro;
 263         res->num_attr = num_attr;
 264
 265         /* Second pass to fill the attr_states */
 266         for (cp = states, i = 0; *cp; i++) {
 267                 cp = parse_attr(src, lineno, cp, &(res->state[i]));
 268         }
 269
 270         return res;
 271 }
 272
 273 /*
 274  * Like info/exclude and .gitignore, the attribute information can
 275  * come from many places.
 276  *
 277  * (1) .gitattribute file of the same directory;
 278  * (2) .gitattribute file of the parent directory if (1) does not have
 279  *      any match; this goes recursively upwards, just like .gitignore.
 280  * (3) $GIT_DIR/info/attributes, which overrides both of the above.
 281  *
 282  * In the same file, later entries override the earlier match, so in the
 283  * global list, we would have entries from info/attributes the earliest
 284  * (reading the file from top to bottom), .gitattribute of the root
 285  * directory (again, reading the file from top to bottom) down to the
 286  * current directory, and then scan the list backwards to find the first match.
 287  * This is exactly the same as what is_excluded() does in dir.c to deal with
 288  * .gitignore
 289  */
 290
 291 static struct attr_stack {
 292         struct attr_stack *prev;
 293         char *origin;
 294         size_t originlen;
 295         unsigned num_matches;
 296         unsigned alloc;
 297         struct match_attr **attrs;
 298 } *attr_stack;
 299
 300 static void free_attr_elem(struct attr_stack *e)
 301 {
 302         int i;
 303         free(e->origin);
 304         for (i = 0; i < e->num_matches; i++) {
 305                 struct match_attr *a = e->attrs[i];
 306                 int j;
 307                 for (j = 0; j < a->num_attr; j++) {
 308                         const char *setto = a->state[j].setto;
 309                         if (setto == ATTR__TRUE ||
 310                             setto == ATTR__FALSE ||
 311                             setto == ATTR__UNSET ||
 312                             setto == ATTR__UNKNOWN)
 313                                 ;
 314                         else
 315                                 free((char *) setto);
 316                 }
 317                 free(a);
 318         }
 319         free(e->attrs);
 320         free(e);
 321 }
 322
 323 static const char *builtin_attr[] = {
 324         "[attr]binary -diff -text",
 325         NULL,
 326 };
 327
 328 static void handle_attr_line(struct attr_stack *res,
 329                              const char *line,
 330                              const char *src,
 331                              int lineno,
 332                              int macro_ok)
 333 {
 334         struct match_attr *a;
 335
 336         a = parse_attr_line(line, src, lineno, macro_ok);
 337         if (!a)
 338                 return;
 339         if (res->alloc <= res->num_matches) {
 340                 res->alloc = alloc_nr(res->num_matches);
 341                 res->attrs = xrealloc(res->attrs,
 342                                       sizeof(struct match_attr *) *
 343                                       res->alloc);
 344         }
 345         res->attrs[res->num_matches++] = a;
 346 }
 347
 348 static struct attr_stack *read_attr_from_array(const char **list)
 349 {
 350         struct attr_stack *res;
 351         const char *line;
 352         int lineno = 0;
 353
 354         res = xcalloc(1, sizeof(*res));
 355         while ((line = *(list++)) != NULL)
 356                 handle_attr_line(res, line, "[builtin]", ++lineno, 1);
 357         return res;
 358 }
 359
 360 static enum git_attr_direction direction;
 361 static struct index_state *use_index;
 362
 363 static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
 364 {
 365         FILE *fp = fopen(path, "r");
 366         struct attr_stack *res;
 367         char buf[2048];
 368         int lineno = 0;
 369
 370         if (!fp)
 371                 return NULL;
 372         res = xcalloc(1, sizeof(*res));
 373         while (fgets(buf, sizeof(buf), fp))
 374                 handle_attr_line(res, buf, path, ++lineno, macro_ok);
 375         fclose(fp);
 376         return res;
 377 }
 378
 379 static void *read_index_data(const char *path)
 380 {
 381         int pos, len;
 382         unsigned long sz;
 383         enum object_type type;
 384         void *data;
 385         struct index_state *istate = use_index ? use_index : &the_index;
 386
 387         len = strlen(path);
 388         pos = index_name_pos(istate, path, len);
 389         if (pos < 0) {
 390                 /*
 391                  * We might be in the middle of a merge, in which
 392                  * case we would read stage #2 (ours).
 393                  */
 394                 int i;
 395                 for (i = -pos - 1;
 396                      (pos < 0 && i < istate->cache_nr &&
 397                       !strcmp(istate->cache[i]->name, path));
 398                      i++)
 399                         if (ce_stage(istate->cache[i]) == 2)
 400                                 pos = i;
 401         }
 402         if (pos < 0)
 403                 return NULL;
 404         data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
 405         if (!data || type != OBJ_BLOB) {
 406                 free(data);
 407                 return NULL;
 408         }
 409         return data;
 410 }
 411
 412 static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
 413 {
 414         struct attr_stack *res;
 415         char *buf, *sp;
 416         int lineno = 0;
 417
 418         buf = read_index_data(path);
 419         if (!buf)
 420                 return NULL;
 421
 422         res = xcalloc(1, sizeof(*res));
 423         for (sp = buf; *sp; ) {
 424                 char *ep;
 425                 int more;
 426                 for (ep = sp; *ep && *ep != '\n'; ep++)
 427                         ;
 428                 more = (*ep == '\n');
 429                 *ep = '\0';
 430                 handle_attr_line(res, sp, path, ++lineno, macro_ok);
 431                 sp = ep + more;
 432         }
 433         free(buf);
 434         return res;
 435 }
 436
 437 static struct attr_stack *read_attr(const char *path, int macro_ok)
 438 {
 439         struct attr_stack *res;
 440
 441         if (direction == GIT_ATTR_CHECKOUT) {
 442                 res = read_attr_from_index(path, macro_ok);
 443                 if (!res)
 444                         res = read_attr_from_file(path, macro_ok);
 445         }
 446         else if (direction == GIT_ATTR_CHECKIN) {
 447                 res = read_attr_from_file(path, macro_ok);
 448                 if (!res)
 449                         /*
 450                          * There is no checked out .gitattributes file there, but
 451                          * we might have it in the index.  We allow operation in a
 452                          * sparsely checked out work tree, so read from it.
 453                          */
 454                         res = read_attr_from_index(path, macro_ok);
 455         }
 456         else
 457                 res = read_attr_from_index(path, macro_ok);
 458         if (!res)
 459                 res = xcalloc(1, sizeof(*res));
 460         return res;
 461 }
 462
 463 #if DEBUG_ATTR
 464 static void debug_info(const char *what, struct attr_stack *elem)
 465 {
 466         fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()");
 467 }
 468 static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v)
 469 {
 470         const char *value = v;
 471
 472         if (ATTR_TRUE(value))
 473                 value = "set";
 474         else if (ATTR_FALSE(value))
 475                 value = "unset";
 476         else if (ATTR_UNSET(value))
 477                 value = "unspecified";
 478
 479         fprintf(stderr, "%s: %s => %s (%s)\n",
 480                 what, attr->name, (char *) value, match);
 481 }
 482 #define debug_push(a) debug_info("push", (a))
 483 #define debug_pop(a) debug_info("pop", (a))
 484 #else
 485 #define debug_push(a) do { ; } while (0)
 486 #define debug_pop(a) do { ; } while (0)
 487 #define debug_set(a,b,c,d) do { ; } while (0)
 488 #endif
 489
 490 static void drop_attr_stack(void)
 491 {
 492         while (attr_stack) {
 493                 struct attr_stack *elem = attr_stack;
 494                 attr_stack = elem->prev;
 495                 free_attr_elem(elem);
 496         }
 497 }
 498
 499 static const char *git_etc_gitattributes(void)
 500 {
 501         static const char *system_wide;
 502         if (!system_wide)
 503                 system_wide = system_path(ETC_GITATTRIBUTES);
 504         return system_wide;
 505 }
 506
 507 static int git_attr_system(void)
 508 {
 509         return !git_env_bool("GIT_ATTR_NOSYSTEM", 0);
 510 }
 511
 512 static void bootstrap_attr_stack(void)
 513 {
 514         struct attr_stack *elem;
 515
 516         if (attr_stack)
 517                 return;
 518
 519         elem = read_attr_from_array(builtin_attr);
 520         elem->origin = NULL;
 521         elem->prev = attr_stack;
 522         attr_stack = elem;
 523
 524         if (git_attr_system()) {
 525                 elem = read_attr_from_file(git_etc_gitattributes(), 1);
 526                 if (elem) {
 527                         elem->origin = NULL;
 528                         elem->prev = attr_stack;
 529                         attr_stack = elem;
 530                 }
 531         }
 532
 533         if (git_attributes_file) {
 534                 elem = read_attr_from_file(git_attributes_file, 1);
 535                 if (elem) {
 536                         elem->origin = NULL;
 537                         elem->prev = attr_stack;
 538                         attr_stack = elem;
 539                 }
 540         }
 541
 542         if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
 543                 elem = read_attr(GITATTRIBUTES_FILE, 1);
 544                 elem->origin = xstrdup("");
 545                 elem->originlen = 0;
 546                 elem->prev = attr_stack;
 547                 attr_stack = elem;
 548                 debug_push(elem);
 549         }
 550
 551         elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1);
 552         if (!elem)
 553                 elem = xcalloc(1, sizeof(*elem));
 554         elem->origin = NULL;
 555         elem->prev = attr_stack;
 556         attr_stack = elem;
 557 }
 558
 559 static void prepare_attr_stack(const char *path)
 560 {
 561         struct attr_stack *elem, *info;
 562         int dirlen, len;
 563         const char *cp;
 564
 565         cp = strrchr(path, '/');
 566         if (!cp)
 567                 dirlen = 0;
 568         else
 569                 dirlen = cp - path;
 570
 571         /*
 572          * At the bottom of the attribute stack is the built-in
 573          * set of attribute definitions, followed by the contents
 574          * of $(prefix)/etc/gitattributes and a file specified by
 575          * core.attributesfile.  Then, contents from
 576          * .gitattribute files from directories closer to the
 577          * root to the ones in deeper directories are pushed
 578          * to the stack.  Finally, at the very top of the stack
 579          * we always keep the contents of $GIT_DIR/info/attributes.
 580          *
 581          * When checking, we use entries from near the top of the
 582          * stack, preferring $GIT_DIR/info/attributes, then
 583          * .gitattributes in deeper directories to shallower ones,
 584          * and finally use the built-in set as the default.
 585          */
 586         bootstrap_attr_stack();
 587
 588         /*
 589          * Pop the "info" one that is always at the top of the stack.
 590          */
 591         info = attr_stack;
 592         attr_stack = info->prev;
 593
 594         /*
 595          * Pop the ones from directories that are not the prefix of
 596          * the path we are checking. Break out of the loop when we see
 597          * the root one (whose origin is an empty string "") or the builtin
 598          * one (whose origin is NULL) without popping it.
 599          */
 600         while (attr_stack->origin) {
 601                 int namelen = strlen(attr_stack->origin);
 602
 603                 elem = attr_stack;
 604                 if (namelen <= dirlen &&
 605                     !strncmp(elem->origin, path, namelen) &&
 606                     (!namelen || path[namelen] == '/'))
 607                         break;
 608
 609                 debug_pop(elem);
 610                 attr_stack = elem->prev;
 611                 free_attr_elem(elem);
 612         }
 613
 614         /*
 615          * Read from parent directories and push them down
 616          */
 617         if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
 618                 /*
 619                  * bootstrap_attr_stack() should have added, and the
 620                  * above loop should have stopped before popping, the
 621                  * root element whose attr_stack->origin is set to an
 622                  * empty string.
 623                  */
 624                 struct strbuf pathbuf = STRBUF_INIT;
 625
 626                 assert(attr_stack->origin);
 627                 while (1) {
 628                         len = strlen(attr_stack->origin);
 629                         if (dirlen <= len)
 630                                 break;
 631                         cp = memchr(path + len + 1, '/', dirlen - len - 1);
 632                         if (!cp)
 633                                 cp = path + dirlen;
 634                         strbuf_add(&pathbuf, path, cp - path);
 635                         strbuf_addch(&pathbuf, '/');
 636                         strbuf_addstr(&pathbuf, GITATTRIBUTES_FILE);
 637                         elem = read_attr(pathbuf.buf, 0);
 638                         strbuf_setlen(&pathbuf, cp - path);
 639                         elem->origin = strbuf_detach(&pathbuf, &elem->originlen);
 640                         elem->prev = attr_stack;
 641                         attr_stack = elem;
 642                         debug_push(elem);
 643                 }
 644
 645                 strbuf_release(&pathbuf);
 646         }
 647
 648         /*
 649          * Finally push the "info" one at the top of the stack.
 650          */
 651         info->prev = attr_stack;
 652         attr_stack = info;
 653 }
 654
 655 static int path_matches(const char *pathname, int pathlen,
 656                         const char *basename,
 657                         const struct pattern *pat,
 658                         const char *base, int baselen)
 659 {
 660         const char *pattern = pat->pattern;
 661         int prefix = pat->nowildcardlen;
 662
 663         if (pat->flags & EXC_FLAG_NODIR) {
 664                 return match_basename(basename,
 665                                       pathlen - (basename - pathname),
 666                                       pattern, prefix,
 667                                       pat->patternlen, pat->flags);
 668         }
 669         return match_pathname(pathname, pathlen,
 670                               base, baselen,
 671                               pattern, prefix, pat->patternlen, pat->flags);
 672 }
 673
 674 static int macroexpand_one(int attr_nr, int rem);
 675
 676 static int fill_one(const char *what, struct match_attr *a, int rem)
 677 {
 678         struct git_attr_check *check = check_all_attr;
 679         int i;
 680
 681         for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) {
 682                 struct git_attr *attr = a->state[i].attr;
 683                 const char **n = &(check[attr->attr_nr].value);
 684                 const char *v = a->state[i].setto;
 685
 686                 if (*n == ATTR__UNKNOWN) {
 687                         debug_set(what,
 688                                   a->is_macro ? a->u.attr->name : a->u.pattern,
 689                                   attr, v);
 690                         *n = v;
 691                         rem--;
 692                         rem = macroexpand_one(attr->attr_nr, rem);
 693                 }
 694         }
 695         return rem;
 696 }
 697
 698 static int fill(const char *path, int pathlen, const char *basename,
 699                 struct attr_stack *stk, int rem)
 700 {
 701         int i;
 702         const char *base = stk->origin ? stk->origin : "";
 703
 704         for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
 705                 struct match_attr *a = stk->attrs[i];
 706                 if (a->is_macro)
 707                         continue;
 708                 if (path_matches(path, pathlen, basename,
 709                                  &a->u.pat, base, stk->originlen))
 710                         rem = fill_one("fill", a, rem);
 711         }
 712         return rem;
 713 }
 714
 715 static int macroexpand_one(int attr_nr, int rem)
 716 {
 717         struct attr_stack *stk;
 718         struct match_attr *a = NULL;
 719         int i;
 720
 721         if (check_all_attr[attr_nr].value != ATTR__TRUE)
 722                 return rem;
 723
 724         for (stk = attr_stack; !a && stk; stk = stk->prev)
 725                 for (i = stk->num_matches - 1; !a && 0 <= i; i--) {
 726                         struct match_attr *ma = stk->attrs[i];
 727                         if (!ma->is_macro)
 728                                 continue;
 729                         if (ma->u.attr->attr_nr == attr_nr)
 730                                 a = ma;
 731                 }
 732
 733         if (a)
 734                 rem = fill_one("expand", a, rem);
 735
 736         return rem;
 737 }
 738
 739 /*
 740  * Collect all attributes for path into the array pointed to by
 741  * check_all_attr.
 742  */
 743 static void collect_all_attrs(const char *path)
 744 {
 745         struct attr_stack *stk;
 746         int i, pathlen, rem;
 747         const char *basename;
 748
 749         prepare_attr_stack(path);
 750         for (i = 0; i < attr_nr; i++)
 751                 check_all_attr[i].value = ATTR__UNKNOWN;
 752
 753         basename = strrchr(path, '/');
 754         basename = basename ? basename + 1 : path;
 755
 756         pathlen = strlen(path);
 757         rem = attr_nr;
 758         for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
 759                 rem = fill(path, pathlen, basename, stk, rem);
 760 }
 761
 762 int git_check_attr(const char *path, int num, struct git_attr_check *check)
 763 {
 764         int i;
 765
 766         collect_all_attrs(path);
 767
 768         for (i = 0; i < num; i++) {
 769                 const char *value = check_all_attr[check[i].attr->attr_nr].value;
 770                 if (value == ATTR__UNKNOWN)
 771                         value = ATTR__UNSET;
 772                 check[i].value = value;
 773         }
 774
 775         return 0;
 776 }
 777
 778 int git_all_attrs(const char *path, int *num, struct git_attr_check **check)
 779 {
 780         int i, count, j;
 781
 782         collect_all_attrs(path);
 783
 784         /* Count the number of attributes that are set. */
 785         count = 0;
 786         for (i = 0; i < attr_nr; i++) {
 787                 const char *value = check_all_attr[i].value;
 788                 if (value != ATTR__UNSET && value != ATTR__UNKNOWN)
 789                         ++count;
 790         }
 791         *num = count;
 792         *check = xmalloc(sizeof(**check) * count);
 793         j = 0;
 794         for (i = 0; i < attr_nr; i++) {
 795                 const char *value = check_all_attr[i].value;
 796                 if (value != ATTR__UNSET && value != ATTR__UNKNOWN) {
 797                         (*check)[j].attr = check_all_attr[i].attr;
 798                         (*check)[j].value = value;
 799                         ++j;
 800                 }
 801         }
 802
 803         return 0;
 804 }
 805
 806 void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate)
 807 {
 808         enum git_attr_direction old = direction;
 809
 810         if (is_bare_repository() && new != GIT_ATTR_INDEX)
 811                 die("BUG: non-INDEX attr direction in a bare repo");
 812
 813         direction = new;
 814         if (new != old)
 815                 drop_attr_stack();
 816         use_index = istate;
 817 }